<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			*{
				margin: 0px;
				padding: 0px;
			}
			.test{
				width: 600px;
				height: 200px;
				border: 1px solid;
				margin: 0 auto;
				background-image: radial-gradient(red 50px, yellow 400px);
				/* linear-gradient(90deg, rgba(0, 0, 0, 0) 10px, rgba(100, 0, 100, 1), green); */
			}
		</style>
	</head>
	<body>
		<div class="test">
			
		</div>
	</body>
</html>